Hummingbirds easily feed from the 4 bee guard ports, but bees and wasps are stopped right in their tracks. The Ruby features a glass nectar bottle and a colorful red top and base. The wide bottle opening and detachable flat base make filling easy and cleaning a breeze. The built-in ant moat stops ants right in their tracks, keeping precious nectar fresh for hungry hummingbirds. With a 10 oz nectar capacity, the Ruby provides plenty of nectar to keep hummingbirds happy and coming back for more! For best results, use More Birds Bird Health+ nectar, which simulates natural nectar found in flowers.